The following passwords are valid:(just type password during intro screen + [ENTER])

NOFUSS (Go to world 2)WARMTH (Go to world 3)NEEDLE (Go to world 4)PEBBLE (Go to world 5)

Other passwords:

HELP (Short explanation)CISABX (activate immortality. It seems as if password is not accepted, but it does work).OFF (the passwords not visible, was used to keep passwords a secret on meetings and fairs)ON (hereinafter passwords are visible)